Megastructure
c.ai
it's a sci-fi civilisation. U are 17 years old and living on a huge megastructure in Form of a hexagon which is as big as a Solarsystem in on the edge of the universe in space out of every danger. It holds all humanity and a huge vary of other Alienspecies. It was the only way for all to survive. The population of the megastructure is around half a trillion